Summary & Overview

HCPCS G0008: Influenza Virus Vaccine Administration

HCPCS Level II code G0008 denotes the administration of an influenza virus vaccine, a common preventive service with national public health importance. This code captures the act of giving the influenza vaccine and is routinely used across outpatient settings during seasonal immunization efforts. Accurate use of G0008 supports immunization tracking, population health initiatives, and claims processing for vaccine delivery.

Key payers included in the scope of this publication are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code’s clinical context and typical sites of service, followed by benchmarks and payer coverage practices where available. The report highlights reimbursement patterns, common billing considerations, and any relevant policy updates that affect vaccine administration claims nationally.

This summary provides operational clarity for billing staff and administrators on where G0008 fits within preventive care coding, what aspects of service it represents, and the payer landscape commonly associated with influenza vaccine administration. Data not available in the input is noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG0008HCPCS Level IIinfluenza vaccinevaccine administrationpreventive careoutpatientimmunization billing

Billing Code Overview

HCPCS Level II code G0008 represents the administration of influenza virus vaccine. The service involves the direct administration of an influenza vaccine to a patient and is categorized as a vaccine administration service.

Service type: Vaccine administration
Typical site of service: Ambulatory clinics, physician offices, pharmacies, and other outpatient settings where vaccinations are provided

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

An adult patient presents to a primary care clinic during influenza season requesting routine immunization. The patient is screened for contraindications and contraindicated allergies, consent is obtained, and vital signs are documented. A licensed nurse or medical assistant prepares the appropriate influenza vaccine formulation, documents lot number and expiration, and administers the vaccine intramuscularly in the deltoid muscle. Post‑vaccination observation for 15 minutes is provided for patients with history of syncope or immediate allergic reactions. Documentation includes vaccine name, manufacturer, lot number, expiration date, route, site, dosage, date and time, administering provider taxonomy, and counseling provided. Billing uses HCPCS Level II code G0008 for administration of influenza virus vaccine for vaccine-only encounters or when payer policy requires a vaccine administration code distinct from vaccine product codes.

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure or other service	Use when an E/M visit is performed and documented separately from the vaccine administration (e.g., acute complaint addressed in addition to vaccine counseling).
`59`	Distinct procedural service	Use to indicate a distinct service when multiple unrelated procedures are reported on the same day and documentation supports separate services.
`76`	Repeat procedure by same physician or other qualified health care professional	Use when influenza vaccine administration is repeated by the same provider during the same day for documented reasons (e.g., wrong dose given initially).
`78`	Unplanned return to the operating/procedure room by the same physician following initial procedure for a related procedure during the postoperative period	Rare for vaccination; use only if an unexpected intervention is required related to the vaccine in a facility setting.
`GT`	Not listed in input; omitted	Data not applicable
`GA`	Waiver of liability statement issued as required by payer policy, individual case	Use when payer requires an Advance Beneficiary Notice or similar waived liability for a vaccine not covered for that beneficiary.
`GZ`	Item or service expected to be denied as not reasonable and necessary	Use when the provider documents that the administration is not reasonable and necessary but the service was furnished.
`GY`	Item or service statutorily excluded or does not meet definition of any Medicare benefit	Use when administration is excluded from coverage under Medicare policy.
`JW`	Not listed in input; omitted	Data not applicable
`LT`	Left side	Use to specify the left deltoid as the injection site when laterality is required by payer or documentation standards.
`RT`	Not listed in input; omitted	Data not applicable
`XE`	Separate encounter — a service that is distinct because it occurred during a separate encounter	Use when the administration occurred on a different date of service than other billed services.
`XS`	Separate structure — a service that is distinct because it was performed on a separate anatomic area	Use when documentation supports that procedures were performed on different anatomic sites.
`XU`	Unusual non-overlapping service	Use when the administration is distinct and not overlapping with other services provided on the same day.
`QK`	Medical direction of two, three, or four concurrent anesthesia procedures	Not applicable to vaccine administration but listed in modifiers; do not use for `G0008`.

Taxonomy Code	Specialty	Notes
`208000000X`	Family Medicine	Most common primary care clinicians administering seasonal influenza vaccines.
`207Q00000X`	Internal Medicine	Internists commonly provide adult immunizations including influenza.
`363LP0800X`	Nurse Practitioner	Nurse practitioners frequently administer vaccines in outpatient settings.
`367500000X`	Preventive Medicine	Preventive medicine specialists involved in population immunization strategies may administer vaccines.
`341600000X`	Registered Nurse	Registered nurses commonly administer vaccines under standing orders or protocols.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z23`	Encounter for immunization	Primary code used to document encounter for influenza vaccine administration when no other diagnosis is addressed.
`J00`	Acute nasopharyngitis [common cold]	May be listed as concurrent diagnosis if patient has minor upper respiratory symptoms that do not preclude vaccination per clinical guidance.
`R50.9`	Fever, unspecified	Used with caution; if fever is present, documentation should support clinical decision to vaccinate or defer.
`Z71.89`	Other specified counseling	Used when specific vaccine counseling or education is provided beyond routine consent.
`T88.1XXA`	Other complication of vaccination, initial encounter	Used if an adverse reaction occurs and requires evaluation during the encounter.
`Z28.3`	Underimmunization status	Used for patients with incomplete immunization history to indicate need for vaccines, including influenza.
`Z00.00`	Encounter for general adult medical examination without abnormal findings	May be used when influenza vaccination is administered during a preventive visit.
`J11.1`	Influenza due to unidentified influenza virus with other respiratory manifestations	Typically a contraindication to vaccination during active influenza illness; relevant for clinical decision-making.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`90471`	Immunization administration (intramuscular, single or first component)	Commonly billed for influenza vaccine administration when payer prefers CPT vaccine administration codes instead of HCPCS Level II `G0008`.
`90472`	Each additional vaccine component, per administration	Used when multiple vaccine components are administered during the same encounter in addition to the influenza vaccine.
`90460`	Immunization administration percutaneous, intradermal, subcutaneous, or intramuscular; first vaccine/toxoid component (includes counseling) when performed with another E/M service	Used when vaccine administration includes counseling and is reported with a separate E/M on the same day per payer rules.
`90686`	Influenza virus vaccine, quadrivalent, for intramuscular use, split virus, preservative-free, 0.5 mL dosage (manufacturer-specific codes vary)	Vaccine product codes are reported in conjunction with administration code; product code selection depends on specific vaccine used.
`90474`	Each additional single vaccine administration (intramuscular or subcutaneous)	Used if multiple injections are administered and payer requires reporting of each injection separately.